Features: Parking site searching Voice recording & Self-portrait Bluetooth connection with 2 additional anti-lost devices simultaneously. Easily track lost items using your smartphone app. Helps prevent loss of kids, pets, and valuables. Attach to keys, wallets, phones, watches, pets, kids, or other valuable items. Low energy consumption with replaceable CR2032 lithium coin battery; lasts up to six months; user-replaceable. Compact and portable design. Specifications: Material: Plastic Color: 2x White + 2x Black Quantity: 4 pcs Shape: Square (37*37mm) Working Distance: 25m in outdoor environment Battery: CR2032 Lithium Coin Battery 1. Find lost items – Ring your lost items from your smartphone within Bluetooth range; the anti-lost device emits a loud sound until found. 2. Find your phone – Double-press the button on the anti-lost device to make your phone ring. 3. Last place seen – With the app running in the background, it records the last known location and time of your item. 4. Community Find – Join a global network where users help locate lost items by anonymously updating the location when in range. Compatible Devices: Bluetooth Version: Bluetooth 4.0 Low Energy Apple iOS 11.0 and above (iPhone 5S and later), Android 9.0 and above Operations: 1. Power Switch: * Power on: Press and hold for approximately 3 seconds; three beeps sound, indicator flashes rapidly for 10 seconds. If no connection or button input, it flashes every 2 seconds for 30 seconds then powers off. * Power off: Long press for about 3 seconds; one long beep sounds and the indicator light turns off. 2. Add Device: Enable smartphone Bluetooth, open the app, skip the startup screen, and go directly to the "Add Device" screen. Refer to the manual for differences between Android and iOS interfaces. Click the "Add Device" icon. After detecting a new device, select Auto Connect. Optionally, rename the device. Once connected, click the alarm icon; the anti-lost device will emit a "beep" sound. Click again to stop. Access settings to customize ringtone, alarm distance, and other options. In system settings, view voice recordings and configure double-press functions. 3. Camera Function: Use the camera feature by pressing the button on the anti-lost device to trigger the smartphone camera. 4. Positioning: The app saves the last known location when the anti-lost device disconnects from the phone. View this in the "Lost Record" section. Requires GPS enabled and active network connection on the phone. Package Includes: 4 x Anti-Lost Trackers (2 White + 2 Black)